不同边界层参数化方案对天津一次海陆风过程模拟对比分析

Contrastive Analysis of Four PBL Parameterization Schemes by Simulating Sea Breeze and Land Breeze at a time in Tianjin

针对行星边界层物理组成多元,气象要素分布不均匀且特点复杂,选用WRF模式中4种运用广泛的行星边界层参数化方案(YSU、MYJ、ACM2、UW)进行数值模拟实验。结果表明:(1)4种方案均有效模拟出相关气象要素,且基于天津这一沿海城市成功模拟出海陆风;(2)4种方案原理上不尽相同,但是模拟结果中主体趋势都一致;(3)对于不同的下垫面,使用合适的方案可大大提高模拟精度;(4)目前的WRF模式还不能准确地模拟出小尺度风。

In view of the fact that the planetary boundary layer （PBL） is composed of multivariant physical composition, four PBL schemes which have been widely used （YUS, MY J, ACM2, UW） are applied to numerical simulation experiments with the WRF model. The results show that： 1.The schemes can effectively simulate the related meteorological elements, in particular, a sea-land breeze. 2. Though the principles of parameters are not the same, the important trends are consistent. 3. For different types of underlying surface, the appropriate schemes can greatly improve accuracy. 4. The WRF model may not accurately simulate the small scale wind at the moment.